Adderall combines amphetamine and dextroamphetamine, both of which are central nervous system stimulants. These ingredients help to enhance concentration and reduce hyperactive and impulsive behaviors by altering the levels of certain natural substances in the brain. Given its potential for misuse and dependency, Adderall is classified as a controlled substance and must be used under medical supervision. Adderall comes in two leading forms Adderall XR and Adderall IR